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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39ed47859a4f6720483d59134c62066db25c2ac5843eacf136c7dd4e46e6e492' 
  AND token = 'T0B/D42GiMZ34R2rxOnEKnbUJzevlKWLHVRGGpmLfPs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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