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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d27a74fc35bc875c4e42a667725dbe02b76707d2d8e61250694a36df64323b5' 
  AND token = '0nyUI5vDmjt5SWSPNbvqhNRgh0lEvafxOQN7mBGL/Ww=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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