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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e932ad9a0380a919b110c287700381c0ea455f287ccd56edce5195b98bc890ba' 
  AND token = 'EgRM+2YwpF/W+cMTljWQiFSAQVI2cHXxtIdJi2Vlwf8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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