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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '66bab5e4ab40033709b4e0f6cb25bd51e9d63556206c8e41b4825f7f864db35b' 
  AND token = '73kE9RwMeGHlhRDZcLWKQHwtYh7Np1xV2LJ8KfKtpQM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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