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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df9f587e2bf3f7f526fbd4af159dcc31de8a0ed2355411abfcd074f6bde150e0' 
  AND token = 'c3/KmVIsTbzqLGG7CnxFnn3XRDMYe4jmZ149A3ds+wY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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