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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9160ba19835e05ac78ce77d0e309d7d0248c65162cd2892f95e636f4856d7c0' 
  AND token = '0dkufBPft+GN+/sWxCqZvztIeXBmgCHD2DGMPuukqi8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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