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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae9a9de4f1ec3517f884882a59dc81855276968428d256081c7aef35c8ac21a3' 
  AND token = 'J5YvraxKBz+d8n+6ICl8YEsUXIWPdgRj3f+CdNHXRdM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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