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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17cba58b7e59698e4ad157db69ce04c48093a497d1bcb58067a4523e6c68b504' 
  AND token = '8an+Y/qADDkZjL2vxIAZgR/WglEMGP+Ua6IOXqq7Bp8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00064

JSON explain

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