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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '734758243a6c430ce9da71c7452bf64d320590365efe1100ff23a169e281c721' 
  AND token = 'EndcKx20d/DiwQqqPEJAVcdgBtDmJ010Ybye+dPtmPw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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