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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce63137a03ed3f5d67cd8cdb5c2ffebdcb7986352b4d01462417967dae3ffa06' 
  AND token = 'WC+6o2qMzwp/IjDerpE5Fz1PvYgJFII3Tz/k6fEnXH8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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