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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee2747b942cc975503cc25e0047a8c0e9be594ef28db454c0c4c0af7476ecb6f' 
  AND token = 'nQgg8IjAwUXLPdHCynh/c4FmdOqMa9p8taRkj2etkBM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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