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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '287a9fd699b6dc8854feb72a7dad1fe4deda8eba759e0721dbde32106a97c8c0' 
  AND token = 'E+7u00i6c3ERLqUjmJfNnpZT2i2MR9aaskjRWPELQLA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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