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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c47e9db336fe6c46fe85000ac51f547021abbaafffb3ca42da0419f48f1d87b9' 
  AND token = 'bhc2aseuoC/74OeVIVcv3vbGrbo5c+YOXA5Pe+VriXs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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