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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '43858b285b22d85bbc86356be7bbe559b67f094185c35713fb6a25b40db767e4' 
  AND token = 'CusFK58WKJkKoq7TAsuxstCVaiHKV40mOuAK+8Rjv1s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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