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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ccbaf2e90a8b55166870012dea98c3542752415378e590640cf846832dd0c97' 
  AND token = 'dV1p7iHwLyhW9b9Ayh5hzXa7Wr4CUg0Dhi8Qx6dGO1U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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