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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '038cbc18716756545b836ac1361632c0f8d7f7b5b4e19799cbe67076b66c7f00' 
  AND token = 'GahDe18PxvmZCQaRKbxYN7LdUJvvlUdU9WJUMxmHh/I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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