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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91e10d5ecfef0c688acbb5229e86b6a659d3c2811f3fa7c48953b79cfa64a038' 
  AND token = 'WR3tCAALmXAGlPa4/lcD03DaCSSeM08IxsaN3yW0EXo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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