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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8fcdc5b04e2bf365736a0df7ac5e75ba111fb17062dcfa99749e6d003c69ec3e' 
  AND token = 'hYIX9ca4WaCck+6B7qyZhLkGkoJmn07PFLphveq+y2c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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