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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20c32386f84a7de55140a8dac8641ae5cfce29c3d0f79c9c87f81c3e1dee0a3b' 
  AND token = 'GaK8IBkQtDGeAoVf+ngRBO8BbnPBY6B2PdttCtiFfRk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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