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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fdbc5e752bd72082e8e2107e00fbacd480c6b2c31d3a4fcd0a7bfd87129f044e' 
  AND token = '6rwQ2baR+rRHowbC60ZIIZDinVhsbG+vh1FbxN424ak=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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