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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7a16f5aa834ba0d635f187a5ef312a98ceadfcced79f7931e3c724a28d7d0f1' 
  AND token = 'AvvZrzgJe/7M2EdbUnTVawyg6N1KkAE310DC2+Ag0BY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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