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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60551cd43abffb907472d44809a8bf08b5ecd5b091d1aa9b9ecd9a779908679c' 
  AND token = 'mtOummw92TsNIN+Xvl0Ig50pCAoC5+8JzhSWmu0nqE4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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