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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79388fca000a0aaf9d296cac269685aa48e3c0faf5c089fa9f5df6299870dde9' 
  AND token = 'M3d8UYBS3p6UYhI030wUOvKXH+oIqQaYR4rCFZhAljY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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