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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '897699d0652f9d929532ba6cb85fbe59e7965ac84906a42a7f674ba64c2e699a' 
  AND token = '0Az+1kmCKyr7afQSEZScMc4PNIESM4bn9nS+OEXE9rg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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