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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '264961290b357bf20be891a3a0295c65a2dce3ee397e0b2a4567df21501b3cb8' 
  AND token = '1MS/Hu0q7RwhvKZ5oOomZC0rvll4ZrarPhf2FCEXX+g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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