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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96726b6f35123afbc0181ef908846e4c1e735a9c2d5bf5b8d59884247fd62fd3' 
  AND token = 'SnQ5U/1M2pMDR0HxnyLup5SiAoGrZ9V4D8f4IZC7wKc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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