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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b70b6aa28cf3f827b215e4657729c8eda6d4188573fac146360ddc9d79cb9182' 
  AND token = 'BUzv4s/TD9gL81OhWThrN0qEH6JjDrqmNsrM8da7nzA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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