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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e3ed47314d2987a349e0c7eb5e6ac588c0a931483beb62da2c96dd0989df790' 
  AND token = 'yhq9cvvwZ8488wv6SHPrrKWtwjP2pwXKY06An2cBfNs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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