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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07afc6182b7aee4aa2e06c6dd299bd91c9c594883de750ac6695b33dd73367c1' 
  AND token = 'ofXxWYtH77daHUmAGR4elc2NoWGnS62dM8CTE1uVOwU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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