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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2e3d253788d5ec1e1372ed4e928e36565834383b9ce1c9c43ad5ca372359e05' 
  AND token = 'Gizq/5K/pZQUtJICHma62En/IpX0G++PhOIB/B5qUZ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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