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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1b9c11b9c53b1e91fcf1d18787fac1795156bdc2d96274c7dbae4c50d7450c8' 
  AND token = 'ocMDXAcG05i6fTvyn9jAiPqS5xy9W6V8asWU1T2Uqro=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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