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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5102b6064b7b77fdcf79ca1cdb531bf5398ba0a7fe68f7ac8120cefa8f7efded' 
  AND token = '3xcXh79bXbc6VM9zY3FdXlbcH1oX0uWPWRaU5+ry0h4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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