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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62edd9a7dc834359129c0714d31345965c172f441d00fda9275638d1dfba5714' 
  AND token = 'GL+6W7X9XiyL/WWVUOuuC64vNw8R01+u+YfdkQftEuM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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