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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4cc5a2931d5f259d0c26e7d3fe8e59fd88af033069f1c5c895e7b952daca5f10' 
  AND token = 'fOTpFja7lCqHQ4uBBJJdOXQs/5skGPJJO1n3EXHCFpc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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