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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2289000eaf8f552f0d69be4684e395b12b7d8ebcac0c9b3d880f9e6c32f50e05' 
  AND token = 'Va57cVQ3RKJGbaZw5mjxnjTYfQ9hII7DtCx9rHQwbRg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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