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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '212a255faecb5ac18ff8d2a6c11afa37ac53fcc2842bfe4967ad9148be350929' 
  AND token = '9Wa6eDVC8Yp2IGI86b59AMrQhtJI5bOq03rPwy6wNFw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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