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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1bade01de87d9eb9fb630c4c558cbee1ef019944d6e9a1977bd8de9309cfa540' 
  AND token = 'lTCUGa/AbW3RMg1ZnYr6m0RLWQvwO4uM9V1WLlpv6CQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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