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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89c6af66dab27d05ebca4222e43ada0996ee43b55f0d250f8f6edcf844e7a9d7' 
  AND token = 'WR8Cwpehi6ZRfcLUAGceMCMTzug9/AM46Oa9r5nkmiM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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