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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f462087677191a32502609b956db3b3b0a998c2ec1ca224e643c0c84b2234d0' 
  AND token = '8Xovz44xvTBNGAtVwTWV6W5nFHkXYveedYZLHRjeVhM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}