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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0671ec7a8a8a7761fa28d06bf16c63d3763adea34797b958d836f8b91608e4ca' 
  AND token = 'NrLhLKnEmmWP6QlgkLAkDxiDydobW0dMRsSifySvo1k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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