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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1c808e63bc59060df8ae6362b2dcbcb7a0f22ed976d7c7b11e2049d0dc65260' 
  AND token = 'OaHJ41o1kOqEShmArMRj8K+25ygPxEJG6CCPaFEkG+c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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