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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a0570be9ce00d473599ed1f6066e8a77f0b518a0213f91ad9c2431ae48e10c9' 
  AND token = 'HYj9z1qM5yRRRTV+xc03ICWpbA0kEcA5UIAv8+g6+BQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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