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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '275c7bf068b4ab09c200f01f167b34dd95cf4fe72f4beb64a8d4479532581d3c' 
  AND token = '//UBBwCBXA7tkX2CJPQBuxSFt3XYveXNFVV4aPTyJ5c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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