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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b77e94c6eb86ff8982981f0a3b5d0fee84ba4c0c6b0a9ab1718d2c387e852db1' 
  AND token = 'icaQZ1Brb15jsqrtv6BAIb2et4ruFD3pFX8KBynwt0A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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