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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c471302fdbc97785fd4d235415f289f58900e411cd0942b8925883a88ed901fd' 
  AND token = 'nTDPCWG8dRAFgyGuxiIYwFp58hOV2y9YjCuBnqu5Ogo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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