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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '982f159a28afbd76e69a066e6775910eef4e139023dd7154ec681f732e414d25' 
  AND token = 'eZg3pS3ye//qpsgK+AJlC9ktjw4AC3K28E7EANPy2J4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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