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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d871fbad10ec8d3ff9e7e1c2cbdabd8f50523e7f36ecdce9b41fdeaffd02342' 
  AND token = 'zXVjcXQfkxJaJYUIK6XrMDO4alRQ4RYJnw/o5aGqRks=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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