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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2674ad9abb62925a3f80dc99ad953a1d8c9b6507912ba5b786abc21ac0fb6ea2' 
  AND token = 'ZiTuz7SWmhi7S5YJQdkar91xdjA5kPwH/5u+yBCiCRU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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