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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86ee48eba32e85ea0ab9e4274c733f4966b1c1c5463ad56772a9e30f0573a4b0' 
  AND token = '9bh0QJ6k824+OKc9jG3eefUqmlw20iNkqHFwgFyqlIc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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