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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1126203951dba0872d0d2b4f5d6db0c26fb1c127d2bb8410f45338ce170ada55' 
  AND token = 'w3LqylmJmoVTJuZfLOS9ixx2mn50re0qfNVbhy68ODw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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