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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6773df87ffed410e4c7db70358eb959b2106418a48751009999e735581db80b5' 
  AND token = 'QeOqVgp4f2vomh+bAZede8LWAq5H61DtwBPDB1tzlSY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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