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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '27d3c11ec351de97adc75416086f76920d91c2535d5e822763f9c0f3c7f454b1' 
  AND token = 'NkOhbig80JVw78bXBjU2oJttOJcxSQdoDHXh/Ecrbhw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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