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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e6eebcbb789ff9cb6582e3c852a4ebe0c5176aca81b74b6167dca7147d81cd6' 
  AND token = '8SMmbBFZKp0WDBxeyyJ6pgGn4IHIAVnJRQ+5OgDEhpc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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