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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '579e857bc5546ca6df8eeab1c113b59f7623d7fca27752018c3dba7c200690ba' 
  AND token = 'kZoV7vd+QeaR0lZpF+4sp6G2cq0rBNeEQzpI5DpXvRQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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