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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1140afdb33822c4e37df5661823bf1b292b481ff2bf080e3e1fb6a2c277f698' 
  AND token = '4eAWOW2/q3N9/V5LuR3/L1Y1KdlP7+D/mlVvCnKM3nk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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