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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ab2cfbef55df06cab4462ace28e673b60979c90985f30e41c4ef4e779e66372' 
  AND token = '6KYqsS7oeHffVDCLzSiHKPtlLLHpgNvIHqj8PVi5hss=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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