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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c8643694692af29fceb9888433bc6f2cfd615f006bd869a2b4a1f20d6c84cf9' 
  AND token = 'gAJQqkoLaxW+kfFf0b5eDS4J3H76TTD2b3lrO7KHecE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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