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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3150a9c0cd4d5eaaf61bfb3d607764d9e05ba68e7564eded46209d7e912405e0' 
  AND token = 'G+32FeWfFFihlISGBuuymnb6vQoFszmmfyh7NIuEol8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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